MP28164 – SINGLE-INDUCTOR, BUCK-BOOST CONVERTER WITH 4.2A SWITCHES

MP28164 Rev. 1.0

www.MonolithicPower.com

12

3/28/2016

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PIN FUNCTIONS

Pin #

Name

Description

1

EN

On/off control. Pull EN high to enable the MP28164; pull EN down or leave EN floating to

disable all internal circuits. EN is pulled down to AGND with 1.5MΩ internally.

2

MODE/

SYNC

Operation mode selection. If MODE/SYNC is low, the MP28164 switches between PSM

and fixed frequency PWM automatically, according to the load level. If MODE/SYNC is high,

the MP28164 works in fixed frquency PWM mode continuously. An external clock can be

applied to MODE/SYNC for switching frequency synchronization. MODE/SYNC is pulled

down to AGND with 1MΩ internally. MODE/SYNC should be pulled high or low through a

resistor smaller than 10kΩ.

3

PG

Power good indicator. PG switches high and low based on the feedback voltage (FB).

4

VCC

Supply voltage for control stage. VCC is powered by the higher value of VIN or VOUT.

Decouple VCC with a 1μF capacitor.

5

AGND

Signal ground.

6

FB

Output voltage feedback. Keep FB and its associated traces far from noise sources like

SW.

7

VOUT

Buck-boost converter output. An output capacitor should be placed close to VOUT and

PGND.

8

SW2

Switch. Internal switches are connected to SW2. Connect an inductor between SW1 and

SW2.

9

PGND

Power ground.

10

SW1

Switch. Internal switches are connected to SW1. Connect an inductor between SW1 and

SW2.

11

VIN

Supply voltage for power stage.